Hi, My husband had consulted an Ortho for low back pain who had suggested to do an MRI whose report has been attached here. He diagnosed him with SI arthritis and suggested to do few more blood test such as esr, crp, ra factor and hla- b27. I wanted a second opinion if based on the MRI findings if it is suggestive of arthritis and should we be doing further blood tests since the pain usually lasts 2-3 days in absence of pain killers, hence we aren't sure if arthritis is suspected.